Safety device for cranking mechanism of internal-combustion engines



F. R. McGOUGH.

SAFETY DEVICE FOR CRANKING MECHANISM OF INTERNAL COMBUSTION ENGINES. APPLICATION 'FILED MAR 31, I920.

1,41 1,500, Patented Apr. 4, 1922.

2 SHEETS-SHEET 1- F. R. M'cGOUGH.

SAFETY DEVICE FOR CRANKING MECHANISM OF INTERNAL CDMBUSTION ENGINES.

APPLICATION FILED MAR. 3|, 1920.

Patented Apr. 4, 1922.,

2 SHEETS-SHEET 2- wow ai f UNITED "STATES FATENTH OFFICEt- I rnanx'n. ivreqouen, or nutr'rnnoNrrnNA;

SAFETY nnvron roe CRANKING Mnonirmsm or INTERNAL-COMBUS ION"nneinns.

Specification of Letters Patented Apr. 4, 1922.,

Application filed March 31, 1920. Serial Nd. '370,392.

safety means for crankinginternal combus tion engines, which is so constructed as .to

prevent retrograde movement of a crank when the engine backfires, thereby preventing injury to the operator of the engine.

A further object of the invention is to pre- "vent retrograde movement of a starting crank of a motor vehicle so asto prevent 1n ury to the operator of the engine when the same back fires, whichis so constructed as to permita limited movementof the crank 'soas to permit the disengagement ofthe cam notches formed in the inner i starting crank with thepins,cai,'r1ed*-b 2 ank shaft ftheengine 1 A furth 1- ob ect or hicles, and which is so constructed that retrograde movement beyond a certain distance is i absolutely eliminated, the'means for preventing said movement including a ratchet spool and dogs carried by the attaching frame.

A still further object of the invention is to provide an improved safety cranking device embodying a ratchet spool loosely fitted on the crank having dogs for engaging said spool to prevent retrograde movement thereof, the crank having means formed thereon for engaging said spool so to permit a limited reverse movement of the crank in relation to the spool.

A still further object of the invention is to provide an improved safety cranking device for internal combustion engines of the above character, which is durable and efficient in use, one that is simple and easy to manufacture, and one which can be placed upon the market at a reasonable cost.

Other objects and advantages of the invention will appear in the following detailed thefini ention provide an improvedsafety cranking device" embodying a frame which 'canbe readily and easily attached toall makes-of motor've description, taken in connection with the drawings, forming a part of this specification, in which drawings:

Figure 1 is a side elevation of the'iinproved cranking device showing the same attached to a motor vehicle and engine, the engine and motor-vehicle being shown in section;

Figure 2 is an:enlarged fragmentary vertical'section through thei cranking device. v v a V Figure 3 is an enlarged transverse section" through the mproved cranking dev ce, and Fi ure 41s a horizontal section taken on theli ne 4-1 ofFigure j Referring. 0., e drawings in detail,

wherein similar reference characters designate corresponding parts throughout the several views, 'theletter'Aindicates a 'motor vehicle having the improved cranking device 13 .attached thereto. The' motor ve'hi'cleA, includes the front bar C and the engine D: The motor vehicle A maybeof the ordinar V orany preferred type and the frontbar I thereof'supportsthe casingo formingaportion of the improved cranking attachmentjB.

"The casing '5 is secured to the frontbar Gby F the U-bolts 6, the lower terminals 1 of which are united by across pl'ate7, whiohengages the lower surface of'the bar. The Uebolts 6 have threadedon their terminals the nuts 8 whichengage the lower surface of'the" cross plate 7. The crank case of the internal combustion engine supports a bearing '9, in which is rotatably supported the horizontal portion 10 of the crank 11, theinner end ,of which is provided withthe cam notches 11 for the reception of the radially extending pins 12 carried by the crank shaft 13 of the engine.

The improved safety cranking device ineludes the crank 11 which is rotatably mounted in the casing 5, which, as stated, is secured to the front axle C by the U-bolts 6. The casing 5 includes the relatively thick plate .14, formed of metal or the like, one face of which is provided with a substantially circular notch 15, in which is rotatably mounted the spool 16. The spool 16 rotatably receives the horizontal portion 10 of the crank 11 and is provided with a reduced extension 17, which is rotatably mounted in an opening 18 formed in the plate 14 which is arranged in concentric re- I cenltrals enlargement 24 f r the eeeptipn v.01

lation togi h Qi u n tchi qu ax otchh l in i? which form houses or the paiivls 2d 'iii'ic'l "21 t h o WW l n h rein, m ni die h illg d esdribdil fi Thii piifi is t) an d l w e which is necessary and desirable. While the $111 It 51v" e itsea' The front end of the plate 14 has boltedpr otherwise secu t ar ivotall mounted in the notches m1" thereto the cover plate 23, which carries t e the fcrwerde d otthe spool. .1 w ich. pro:

jects beyond the notch 15, formed in the rel atirelnithick plate 1 1- spo l, 1 ..intermedlatehits ends is provided with ratchet,

1 teeth which are adapted to be engaged teethib'ythe exm ISiOn Springs 26. These by v the oppositely disposed pawls 21 and 20.

orpawls 20 and 21 are normally 1 he dogs t urged nto engagement with the ratchet dogs or pawls 20 and21 prevent retrograde or cmmten clockwise movem nt. f the spool hiand when the crank 10 is 1 connected thsret lyi jur' 1 i prevent d t h driv r of the vehicle w en cranking the enginewhen Teconnect thsc nk 11 wi h thesneel the fonwerd end thereof is proy ided with diametrically opposed inclined or curved ate/9t i whiehiisi adant dm engage the r iame mitel x extend ng" p n nr diby. i, he; herriecntehportio 101 i t ank 1e wister: b 13 9 the sp 1 lerz eda i is mintee. cl ar gi shown vFigui 'e 4; t t

' 1 spring 29m is arranged he cra k t 11i illno m l y eimlt agement withtlie pins 12. E The pins 28 will, normally Hi6 iali thfi ollt el" end ofthe slots 27 and when 'theJcrank 11 is pushed inwardly into operatiye position e pins 28will ride {to the inner ends of the cam slots,

If the engine backfires, the dogs 20 ,and 21 will ,prevent retrograde movement of the andv normfl vy ql fili 1 W mapmih ed p s t qhs th 0 1' med o t ei-ii nerende e,

m'iit of'the craiikso as to permit and facili- We the disengag lw 9 thei m 1 11 llwitii the pihs l on the crank she 13 device is shown connected to the cross barof the ,chessis ot a Mgr vehicle, it is to be understood that the same can be connected at any point on the yehicle or engine accord-l ing to the make of the vehicle with which the same is used andthe housingand attaching e eme ts c ng d acc dingly From the foregoingdeepription it canbe,

seen that an improvedmeans is provided 1 hich w l efie t r yis tesuerdt nemter f a mct r1 h le ing e crank ng 1 the engine and which is so constructed .as toflo pr nt a pl a ing appearan e t t e machin and not detractfrom the leeks therepi 7 a ge in eta ls m y em det th ut departing from the spiritor scopeof the invention ebut, 1

I' claim: 1 h 9 bilflti9 1 i h1 n e he e M 1 startingsha tt aligned therewith {idea tow -h ught i t h hliquto op ra ve ent it t e gin s a t safety a t viee tor the starting: emit q u mg i m: a ing a c en t s med neiase1 a Open ng h i r h sdt iconwnt wi i tihhg o e e sie h is h t i. athhtyt sn sd i t e; e s w we ts te nenirh "mile n n e e .b Q ki ham gflt hs e it in 1,

extending notches fo it therein pivotally mounted in ei notehes ratchet teeth f med 1 t e eW smQe e to t e ck ran d t r e e hthe cessesandnotchesand rotatably sup ortgthe spool, the forwardend of thespoo hav in inwardly extending cane, notches form therein, and outivardl extending insi par ried by the starting s raft arranger, to rest in said notches. H i

FRANK 1R. MOGOUGHM in 

